| 摘要 |
An inertia-sensitive device for detecting movement of, or impact on, the device or vibrations in its vicinity comprises a housing having a flat or concave surface, a ball freely supported within the housing upon that surface, the ball and/or the surface having an uneven texture, and a piezoelectric detector in direct or indirect contact with said housing. In one form of the device, which is illustrated, the surface is roughened and extends to a full spherical surface and the ball is of steel.
|
